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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5693fef5092dbb088a9701b18a14b4bab7a1a671df5c9769b00efcec7637f3' 
  AND token = 'YBXVc1+ZVy7oVAQj5rxuaAC1n3aVQYlOyY4/m7Z1dN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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