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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e97e1a233006becf0e3764a4a140596b60ae81e870299e43bba90104b394f03' 
  AND token = 'voFqRlEP2utRtt8Xibj9dK+RJ552+kadkFH92gfj0gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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