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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86022d2adc8fc0d069ff74a7fb8c2270c7b2cb4216a6c43eb14457b53f94f37' 
  AND token = '5bZr4U1uzYDy/QWjCUjL5e0pt9m83ZE2hj4zNmQXvwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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