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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b904d1a07e15c7234cb588fa2a60f49bdce6f6bb6d5a9ac3a5be93e244c77232' 
  AND token = '7Bbm90E94rG4ruLUiHr9uh+KBBMcvU8elnifblFFRjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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