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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcfb2af12d08d351b9485d957195dca3991eecfe5087affbb267b6708bddadb' 
  AND token = 'cJDmJX+ilbfY9iFVn7WRU5bKpv9ALySq3FdFGSVH2MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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