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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd127157129efade51d69bb93e9c9021f702eac9caea8676c54b052d305d4f4ee' 
  AND token = 'vfQ4hu6BCUf+ZvmCjVpt2fyiBnTSBWW5XXxxwfmYwEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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