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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77707e283740da9b58615b33e4d35e00a1586927ec1cb391dac0451edc0de56' 
  AND token = '8FYIIGnSSPU+WA4XcUuUJ9GQl3cXE7NsbJuF8oXPX5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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