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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5452b9ed0cd3a63aee9cfa433ed0a65d3531b1ff58325f2f0c93a33cf60392d' 
  AND token = 'a7ns3tW6hlb/DaFZFm7M+VXIHloEoXtBBAgf1qnGStM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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