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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338653c548dc654ed242a8c17a9f28ec52d922e5bd00ebb9dcdd736224adfd62' 
  AND token = '9u9bBZDH9VJC9z2UBUslbtZ3V/DrgO2OzEQ9ekxV0X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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