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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070b517b4f8208feff298d378f4d12cd9708278e10fbb58937d823f1c44551a9' 
  AND token = 'R/QABmwndjc12fqLaO9H3oQsyzNFg++iHso52G3n6Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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