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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c977f9f42db68a54f629646fb3c8afa339caf5edaf98b92c44217763f8bb5e5a' 
  AND token = '6W77H6hKCUJlV6lvwloz0fi6GuLCxLUGF0cx3MGGo9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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