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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e8d10c01129ec73fae32b913f1d3e0cd27cededc2acf5686fe20dc88074d97' 
  AND token = '5QVEtY7zVDcwIKybn/HyMf0hM/ZHyE71Hx8Fss59GYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}