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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75c175e90ca0894d65da3ee034ea432bcb866dbdb1501d2c08916e922e8d6d3' 
  AND token = '+5gw4JV1QojXx3rcJW3QBo74Hn8X31Ny9w1pQ3wxQm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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