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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb418e5a4ee65da2f4eec78f3e5d4f584f1a865a526b6179af884dd3566deb3' 
  AND token = 'EKccMPfz4koUG5k8SiX4u28AzGW+ITh1yIz+TF1STQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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