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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91265f27aba1bf2becf5767b37d77d80ade626e2b7f6d0dca6c2cf036241da0' 
  AND token = '7tIr3tBxH0v1dpqzXSt5YdR6hU+2IsvH3rRdQauX/kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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