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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056f5faf25cdd20f129fbc3a592e9cb7660df75e2374d30b59cf2eeaa6252afb' 
  AND token = 'CmEPYPNlXkfeWHCIbmMOI+YLHpH37nD0MV73TRHSw+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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