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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aaf248b55a5cc5316a8f4c53c870fa9247f098693d72cba35f2b34640ff00ac' 
  AND token = '28N7ThbHfjbPtbDNBwGPXevN2iP1+scEtt3vBkN/Pfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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