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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5384bb474fac7343fe2ea8a68b62dd46ec742a1051c2a07d6052f09f92692e' 
  AND token = 'GqyGm3PrrVVuee5j1hSYmjEMo3fy3Iwv2fL1dZ/YjMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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