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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e5902ba591f5e588842ae73b0c762236ade8aa7197fcaa0e10a9520d1b0a88' 
  AND token = 'qCw2mMG1f0MLqFrdSZ6GL+Lw3yscvTzOCL6xQHDGKbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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