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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88617723815b0541e7bf97eac358af576003c8f2506840c9f879460535b9a9f' 
  AND token = '45mbaatEII+r8SsWwfjqRbgJnrINns6l2mJYx2ht4cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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