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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05e9aeca1ab15c934a5da1747fa9eb9212317ae92e66c2f2ef93b21b013bba6' 
  AND token = 'eo5+mlQ/bAoFm1lKYTJAiDg3o+t8KzdWIAF6R1gD3Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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