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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95502615d81bfe7c8da495a630f3c7295be3ec69be300f2cf2e26d254a149cd2' 
  AND token = '8me9MYii1RE2kC0ED8u4NBB/1juqxpi+mzxNgoNAw6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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