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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1e30241e08ad45f2a784f8ea0d0e16babdc6508b5ecb49f5c676346d31151c' 
  AND token = '/nxXi6r3rJvIz1X9dOeagXm6HJYf8qkCmEJrTLos/fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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