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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b30938f38dcdef987a44988a0c6660f49886accd197fb18442aab723464617' 
  AND token = 'ra/WrTJNZvZu7in6BEtxzW6OKYdkxmvX238JcNrjJy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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