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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dd9471c917c0475396fab3ecc3f9d53b83e933de1117d8ccdcb59f7ed05692' 
  AND token = 'RMYCIHjXD9ho3lsxLbirC+VkvQGdZ2K29i35ajAV7Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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