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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8e006c620aaf5d89ed50dcd8ab02a5a1d15f43fcc408200b5a6b82b5cfb1da' 
  AND token = 'jDow7Jqlr/gKcSaEcwE/1MT3aZ385tFzwZB+XCHNIKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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