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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b05a18cb47977d7c8f0c6ffb64280b76a8549f5190dd24a293ce15a4a950d0e' 
  AND token = 'qjozCPtHp2gIsoRfPPIMy+mM0YR0wm53XCCqqCi5908=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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