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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0bf76afbcd560c1096d3fc90c58fd669c5191404c4c83b7e7db86f583a1460' 
  AND token = 'ie+GH+Qh/wXC1MiGh3jx+0Nf377t6vb/oGpgT395GqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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