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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b95fcf165103c471e829f2df140651fc8d615984f15661bf21f83db0d1296ba' 
  AND token = 'gANgiDPpCIYpwt+d2ono8S5ttc+0PplSSk5eU8D2Fuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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