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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68203e491595e94bb6717c4443251d59b3e697a64c2db82d7151f26bc7cee1c2' 
  AND token = 'ebZM5pQaAigxcqLkF09j/dTJqwrQVnMII7+T95PCj6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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