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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaf44db8e4c90c93e71228b7bf543269445ac06d6844f83bdb994c5aefda11a' 
  AND token = '6EQJ7bPJdY++ZNd+1pLrR2SQutayupSYvUwk/lc7ek4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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