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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eef5363171ca12bd595196aeb537c14274e088dbb91952b9da38530afb999a2' 
  AND token = 'zrAwW18pn1DjoN8UO55eN0bTE7S0sBiZeVWy881yY8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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