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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc74804f05e12295857f63ea1bd1766c30d813559bf4a0d488a730400a0f7eb4' 
  AND token = 'esSuWpaGovzObksAjBv58E7KzoE1wgfyaKTLhZHZSgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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