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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f91176d9d909a4e1f5778ffed7110f76b55d28129953f1063ec4f409b0f98f' 
  AND token = 'hHE8buHHNQTO+Akm4ZhQjswFh+pC50Jn4XRAlFV/ats=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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