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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a8ce2e72d32308c26ecd2f93eb6bc2e32bba90e41aee953d21f58917f8b87d' 
  AND token = 'JT9A/fsh/ZLlbuelKlbctmmgQT8Y4EO6V4ejYM479dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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