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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1384bb085b22639b3a686aa567fea7a0b631aff5bf3ba946fa9060d9afc236e2' 
  AND token = 'OWz6EE+RRgGj2MSV0n+2zW4Tn3iy89K5JnI3ELkEhSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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