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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2beb8f5e878d3519e36218ced7cf60cea933ee92d00aa0241e50ba3e58904912' 
  AND token = '3UG14nbzAPakdKxL6pnvcOWwtHcwk/+9LOZzRtX0GGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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