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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a596d3a2d975ae6d3d09e479ae3dfc1a360e634c1f4bd286c0bdb8f324a2010e' 
  AND token = 'sjnQySXyo5dYQKjKfZmBCw2yEMzgUoaFHpjyaMoVhJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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