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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845bb5ca95999bb6b580231b8c388cbbdae14069c0806af609c39d2bd62071e6' 
  AND token = 'Ze+CcgCK1vOm2B+bDzy4jrBFQKH+bDCtFREtJMruKUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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