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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77eeff3ce74a4cc867252e5026139f1848c524e1aeeb5855cc4c4f2cc437957a' 
  AND token = 'Ctf1Pg9ZQz28TIXa5PPlzt1IJEqLQZESK0znudOSU0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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