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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238d543438d45cb344b16f0f18feb03837b2dcffb0b9a8be545acd81912aad39' 
  AND token = 'dHPQpSRjWM9/yPQ6KOXGYSPOH/0YMNGt+UkNi9Lz4CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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