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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693438d5474e6f9f7450a5bf6da281cb9a22d3d9b7133350dc0bd811cb5d52ba' 
  AND token = 'aSbmXjqnuPe+wlOrgAPO9CxflTXNha4U6zdbuWMZ6HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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