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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ea0913711d5cb19589e4a9f3da51cf24ebc94454d3c8e6a6526079a6939f02' 
  AND token = 'fBXslWehb980qsg5kjkXUV2HpSWUVog0I/hf2Wuj22w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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