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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b419e0b2b45f7b1c83055014d53b201263d246b14bb43d75ffadd32dffafcf8d' 
  AND token = 'VasG/ZBngvkN3C3njzID9yV7Yj08rG2nvN4t1m5wTuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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