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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693a0a645de8d6b7193a3744321cd0b547aa218efee8b91daef3bd9050dbf128' 
  AND token = 'GdiEtMzPfPe1+A70z9vLr377fJH1ULtNLL7lvginyuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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