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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be8fb1431415822de50b8f02fa21d01ab10162b0c8c7e5ceae68cdf03e30927' 
  AND token = 'GFTUaoN11XKpie/DP57Zcfl95Q/+q1052kAv5rbKnx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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