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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2031d5d23419828986e99e81feb40456f47fe1c88640d27a6aa900b389e09d' 
  AND token = 'OZpH40Ufb19foYlMwh2kBUbu3mTjpdNykY2G8ZhR7FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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