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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ec3eb77635460bcb5db09bc9f927a6e1fb4a320c1d895478d7fec2cab29a16' 
  AND token = '8yhcSzUgDXRPKNy55y5AXjppK2ZLPTSr0i71RZo4z9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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