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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11d51ef8880f43e0a18b70831d447372af3ef68d375550021b6e1f146a023a2' 
  AND token = 'oOi1bW89MzoIPDFJGqVP1a/3eu8ZP5cX5/UZhRSQdvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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