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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f81d856f16a8f155cf4d8beb91d5c9f77af405737373e82108c9a5f0dbbefa8' 
  AND token = 'kUoCzYEMgqTD31l17F7kNmhwbhv8Sn3W+PBLd1Czjd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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