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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19e9bc6549dafb9be88260fdf40021a38e8b3069acbb49567bfd62dff6b43c9' 
  AND token = 'EpxnwDEg707Pq66BeEYgcTuN5ORc/S/iIwevjRn5nsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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