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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e10db8b8ceed263df6146b9e9e19d54886ad37cfe35293b128591acdff883b3' 
  AND token = 'N9bpaNdQcX6PV2PEu0POvCLjaQqwlC54v97sTorsDvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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